How duration and methods of priming may affect the germination of cumin seeds (Cuminum cyminum L.)

The main purpose of this research was to evaluate how duration and priming method may affect the germination and growth of cumin seed (Cuminum cyminum L.). The study was carried out in 3 replication by using a randomized completely block (RCB) design. The experimental treatments included: control, [hydro-priming in two durations of 24 and 48 h], [osmo-priming (0.2% of KNO3 in 24 and 48 h, 0.3% of KNO3 in 24 and48 h)], [hormo-priming (GA3 500ppm in 24 and 48h, GA3 1000ppm in 24 and 48h)]. Results showed that the highest length of seedling was related to the pre-treatment by 0.3% KNO3 and GA3 500ppm in 24 h. Also the maximum length of roots was related to 0.3% KNO3 and hydro-priming in 24h. The highest germination percentage was resulted under hydro-priming in 24h and the maximum fresh weight of seedling shoot was related to the pre-treatment by 0.3% KNO3 in 24h. According to the vigor index there were not significant differences among the 24-hour treatments, however the maximum vigor index was resulted by pre-treatment with GA3 500 ppm. Also, the increase in pre-treatment duration had a negative effect on the vigor index especially by the osmo pre-treatment. Pre-treatment for 24 hours improved the germination ability of seeds and hydro-priming may be suggested as the most effective treatment in comparison with the other treatments, as it increased seed germination, vigor index and also has also lower cost and higher simplicity.